Dashboard / CVE-2026-121491

CVE-2026-121491

CRITICAL
INFO Priority: 0.04 BB Relevance: 68/100
Published: 2026-11-07 Modified: 2026-11-10 First seen: 2026-11-07 Status: active

Attack Surface

Network No Auth No Interaction Conf. Impact Integ. Impact Scope Change

CVSS Vector Breakdown

AV: Network
AC: High
PR: None
UI: None
S: Changed
C: High
I: High
A: High

Description

The Fiber Admin WordPress plugin before 4.0.1 does not validate or escape a request header before writing it into a PHP file it regenerates on an unprotected admin hook, allowing unauthenticated attackers to execute arbitrary code when its custom database error page is enabled and they win a race against an administrator saving its settings.

Weakness Classification (1)

Affected Software (2)

VendorProductVersion
Unknown Fiber Admin 3.1.0 < 4.0.1
Unknown Fiber Admin 3.1.0 < 4.0.1

References & Advisories (1)

Bug Bounty Relevance

68 / 100
✓ Network accessible
✓ No authentication
✓ No user interaction

CVSS Score

9.0 / 10.0 v3.1
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H

EPSS — Exploitation Probability

0.40%
Raw Score 0.003950
Percentile 34.2%
Date 2026-11-13

EPSS Trend

2026-11-13
0.00395
2026-11-12
0.00395
2026-11-10
0.00395
2026-11-09
0.00395
2026-11-08
0.00395
2026-11-07
0.00224

Intelligence Sources

mitre ref →
nvd ref →

External Links